<template>
  <div class="app-container">
    <!-- 章节列表 -->
    <!-- 添加章节按钮 -->
    <div>
      <el-button type="primary" @click="addChapter()">添加章节</el-button>
    </div>

    <!-- 章节列表 -->
    <ul class="chapterList">
      <li v-for="chapter in chapterList" :key="chapter.id">
        <p>
          {{ chapter.title }}
          <span class="acts">
            <el-button type="text" @click="addVideo(chapter.id)"
              >添加课时</el-button
            >
            <el-button type="text" @click="editChapter(chapter.id)"
              >编辑</el-button
            >
            <el-button type="text" @click="removeChapterById(chapter.id)"
              >删除</el-button
            >
          </span>
        </p>
        <ul class="chapterList videoList">
          <li v-for="video in chapter.children" :key="video.id">
            <p>
              {{ video.title }}
              <el-tag v-if="!video.videoSourceId" size="mini" type="danger">
                {{ "尚未上传视频" }}
              </el-tag>
              <span class="acts">
                <el-tag v-if="video.isFree" size="mini" type="success">{{
                  "免费观看"
                }}</el-tag>
                <el-button type="text" @click="editVideo(chapter.id, video.id)"
                  >编辑</el-button
                >
                <el-button type="text" @click="removeVideoById(video.id)"
                  >删除</el-button
                >
              </span>
            </p>
          </li>
        </ul>
      </li>
    </ul>

    <!-- 章节表单对话框 -->
    <ChapterForm ref="chapterForm" />

    <!-- 课时表单对话框 -->
    <VideoForm ref="videoForm" />

    <div style="text-align: center">
      <el-button type="primary" @click="prev()">上一步</el-button>
      <el-button type="primary" @click="next()">下一步</el-button>
    </div>
  </div>
</template>

<script>
import { getAllChapter, removeById } from "@/api/chapter";
import { removeVideo } from "@/api/video";

import ChapterForm from "@/views/course/components/Chapter/Form";
import VideoForm from "@/views/course/components/Video/Form";

export default {
  components: { ChapterForm, VideoForm },
  data() {
    return {
      chapterList: [],
    };
  },
  created() {
    this.fetchNodeList();
  },
  methods: {
    fetchNodeList() {
      getAllChapter(this.$parent.courseId).then((response) => {
        this.chapterList = response.data;
      });
    },
    removeChapterById(chapterId) {
      this.$confirm("此操作将永久删除该章节，是否继续?", "提示", {
        confirmButtonText: "确定",
        cancelButtonText: "取消",
        type: "warning",
      })
        .then(() => {
          return removeById(chapterId);
        })
        .then((response) => {
          this.fetchNodeList();
          this.$message.success(response.message);
        })
        .catch((response) => {
          if (response === "cancel") {
            this.$message.info("已取消删除");
          }
        });
    },
    //添加章节
    addChapter() {
      this.$refs.chapterForm.open();
    },
    //编辑章节
    editChapter(chapterId) {
      this.$refs.chapterForm.open(chapterId);
    },
    //添加课时
    addVideo(chapterId) {
      this.$refs.videoForm.open(chapterId);
    },
    //编辑课时
    editVideo(chapterId, videoId) {
      this.$refs.videoForm.open(chapterId, videoId);
    },
    //删除课时
    removeVideoById(videoId) {
      this.$confirm("此操作将删除该课时及其下的视频, 是否继续?", "提示", {
        confirmButtonText: "确定",
        cancelButtonText: "取消",
        type: "warning",
      })
        .then(() => {
          return removeVideo(videoId);
        })
        .then((response) => {
          this.fetchNodeList();
          this.$message.success(response.message);
        })
        .catch((response) => {
          if (response === "cancel") {
            this.$message.info("已取消删除");
          }
        });
    },
    // 上一步
    prev() {
      this.$parent.active = 0;
    },
    // 下一步
    next() {
      this.$parent.active = 2;
    },
  },
};
</script>

<style>
.chapterList {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
}
.chapterList li {
  position: relative;
}
.chapterList p {
  float: left;
  font-size: 20px;
  margin: 10px 0;
  padding: 10px;
  height: 70px;
  line-height: 50px;
  width: 100%;
  border: 1px solid #ddd;
}
.chapterList .acts {
  float: right;
  font-size: 14px;
}

.videoList {
  padding-left: 50px;
}
.videoList p {
  float: left;
  font-size: 14px;
  margin: 10px 0;
  padding: 10px;
  height: 50px;
  line-height: 30px;
  width: 100%;
  border: 1px dashed #ddd;
}
</style>